Both battles were lost, more than 1,000 white soldiers were lost, the South African colonial army was almost completely wiped out, and only 14,000 troops were left in the available army, and the 30,000 reinforcements promised by Brazil would take a week to reach Argentina to make peace with the British.

With insufficient troops, Gordon could only urge the Brazilian side to speed up and let 30,000 reinforcements board the ship as soon as possible to rush to the offshore port of Buenos Aires, and at the same time ordered the British fleet that was stuck in Tigre to abandon the entanglement with the Wehrmacht, bypass the defense line in the waters around Tigre, sail inland along the confluence of the Paraná River and the Rio de la Plata, blockade and wait for an opportunity to occupy the important town of Rosario as soon as possible, and cut off the water supply route between the Han mainland and the front-line Wehrmacht.

At noon on May 18, more than 20 frigates and small battleships were divided into two groups, front and rear, escorting more than 40 transport ships and supply ships to sail in the direction of Rosario.

At 5:20 p.m., when the British fleet reached the sea area about 30 kilometers from Rosario, several deafening explosions caused the commander of the British detachment, Colonel Beard, to change his face suddenly.

Accompanied by a huge explosion, the calm water surface instantly rolled up a wave seven or eight meters high, and the wave that hit the air high into the air was stagnant for a few seconds, and then the heavy potential energy carried tens of tons of water and slapped on the warship that was attacked by the explosion.

Injured by the thunder and devastated by the waves, the two small warships sailing in the waters ahead instantly lost their balance, and more than 40 British naval soldiers were thrown off the deck of the warship by the explosion and the waves set off by the explosion, and fell heavily into the tumbling water.

The first wave of mine explosions resulted in two sinking and one wounding, and the two British frigates with a displacement of about 1,500 tons struggled on the surface of the water for only more than 30 seconds, and the British soldiers in the warship's control room and weapons room were swallowed up by the surging river and slowly sank into the cool river with the warships before they could recover from the aftermath of the explosion.

The two frigates were silent, and more than 200 naval soldiers on the two warships were buried underwater, while the other frigate that was hit by a mine was not silent, but the warship's hull was seriously damaged and could not continue to sail with the fleet.

The tragic situation of the three mine-striking frigates was intuitively displayed in Beard's eyes, and his fleet had paid the loss of three warships before engaging the defenders of Rosario, and Beard could guess what Gordon's expression would be if he received his own battle damage report.

The sudden explosion of a mine strikes makes Beard, who had just suffered a defeat in the battle of Tigre, feel even more angry and distressed.

Ordered two medium-sized frigates to salvage and rescue the overboard naval soldiers, Beard immediately issued a battle order, ordering four warships to be dispatched to carry out demining tasks, and other warships, including transport ships, logistics supply ships, and other ships, all suspended their movements, and waited until the four forward warships cleared the threat of mines, and then the fleet continued to sail.

At 5:47 p.m., more than six or seven British ships were temporarily moored in the open water, anxiously awaiting news from the demining ships ahead.

"Colonel, Sir Gordon's telegram!"

The communications officer ran to the deck and handed a telegram to Colonel Beard: "Argentine President Urquiza was attacked by Han troops on his way to retreat, and Sir Gordon ordered the fleet to arrive in Rosario before seven o'clock in the evening, and land in the ports around Rosario within two days at the latest, to meet the retreat of the remnants of the Argentine army!" ”

"Where are the Agen forces now, and how many troops do they have left?"

"Álvarez, about one hundred and sixty kilometers from Rosario."

Recalling the contents of the telegram, the communications officer quickly replied: "Yesterday evening, the Argentine troops were attacked by the Han troops, and lost more than 20,000 troops, and less than 30,000 troops escaped for the time being. ”

"Álvarez, Rosario, Córdoba," Beard took out the march map, roughly browsed the geography of the three places, shook his head and said, "The road for Urquiza to send troops to Buenos Aires is occupied, and the road from Alvarez to Cordoba is only one that crosses Rosario, and if Rosario is not occupied by the Han troops, it is impossible for Urquiza to return to Córdoba safely." ”

"The main force of the Argentine troops was damaged, and Sir Gordon ordered the colonel to abandon the combat mission of covering the return of the Argentine troops to Córdoba in due course according to the changes in the situation on the battlefield on the front line."

"The waters of Rosario on the Paraná River are full of mines, and the fleet has lost the best opportunity to occupy Rosario."

Beard looked down at the map for a moment, then raised his head and ordered, "Send two more warships to carry out minesweeping missions, change the combat objective to Alvial, each ship will prepare for battle, and set off on time in half an hour!" ”

Accepting a new combat mission, the British fleet, which was anchored and waiting, quickly moved into action, and the six minesweepers in front also accelerated the speed of clearing mines,

At 6:17 a.m., as soon as the sun had set over the mountain, another warship on the vast Paraná River was struck by a minesweeper and sank, paying the price of four warships in total, and the British fleet opened up a safe passage more than 10 kilometers long, and the follow-up warships accelerated along a narrow water path under the guidance of five minesweepers.

Urquisa was cunning and sophisticated, infiltrated Argentine politics for decades, and survived his old rival Mitre, but in the end he still did not escape the blows of the Wehrmacht.

When the news of the capture of Buenos Aires by the Wehrmacht reached Urquiza's ears, sensing that the situation was not good, Urquisa first concealed the news of the destruction of the main force of the Argentine Federation, and then quietly withdrew the troops that obeyed his orders, and replaced them with Argentine troops from other provinces to continue to attack the Wehrmacht troops, making a pretense that everything was normal, and then that night, Urquiza, who had prepared in a hurry, retreated in the direction of Córdoba with more than 20,000 troops, and the next morning, More than 50,000 Wehrmacht troops arrived from the direction of Buenos Aires to the positions of the two sides and immediately joined the offensive against the Argentine forces.

The fall of Buenos Aires, the death of Mitre, the flight of friendly troops, one bad news after another crushed the Argentine troops that were not subordinate to each other, the battle lasted less than a morning, and at about 12 o'clock at noon, the more than 36,000 Argentine local troops abandoned by Urquiza were all captured, and the remaining 34,000 were all captured, and less than 600 escaped by taking advantage of the chaos.

At the same time, considering that the other party announced on the way to leave the political influence of temporarily taking over as the president of Argentina and calling on Argentine civilians to take up arms to resist the rule of the Wehrmacht, as soon as he learned that Urquiza had escaped, Li Mingyuan quickly ordered the westward troops to dispatch troops to pursue Urquisa, and absolutely not let him escape back to Córdoba.

Morale was low, logistics, supplies were mostly abandoned because of the rush to escape, the march of the Argentine troops slowed down greatly, on the night of May 17, Urquiza's retreat found that the road back to the army was occupied by the Wehrmacht, and in a hurry, Urquiza ordered the troops to launch three rounds of attacks, but the three rounds of attacks failed again and again, at this time it was reported that the large force of the Wehrmacht in the rear was less than 30 kilometers away from his side, and he was shocked and frightened, and Urquiza, who was worried that he had taken the back road of Mitre, had to order the troops to abandon the attack, Instead, he took the Rosario line, hoping to open a passage back to Córdoba with the support of the British fleet.

At 8 p.m. on May 18, the British fleet suddenly launched an attack on the small riverside town of Alvial, thirteen kilometers from Rosario.

Naval artillery shelling, infantry followed. More than 1,000 third-line militia units of the Wehrmacht were defeated by the British offensive, and after paying more than 400 casualties, they fought and retreated to cover the evacuation of the wounded from the battlefield, and ceded Alviar to the British landing force.

On the morning of 20 May, 4,000 British reinforcements marched out of Alviar and attacked all the way, but were blocked by Wehrmacht troops and were never able to join up with Urquiza's headquarters.

At three o'clock in the afternoon of May 20, the Argentine troops fleeing for their lives were surrounded by the Wehrmacht, and two hours later, as Urquiza raised his hand and surrendered, the remaining Argentine troops gave up resistance one after another, while the British troops, who had lost their rescue target, feared that they would be besieged by the Wehrmacht far from the fleet, and after the last rescue attempt failed, the withdrawal disengaged from the Wehrmacht.

With the surrender of Urquiza and the extinction of the Argentine armed forces, the occupation of all parts of Argentina by the Wehrmacht began rapidly.

On May 20, the President of Uruguay fled the British Expeditionary Fleet, and on the 21st the Uruguayan capital Montevideo fell, and five days later, Mercedes, which had held out for months, was broken, and the entire territory of Uruguay was occupied by the Wehrmacht.

On 27 May, after a day of fighting, the Wehrmacht eliminated more than 4,000 Argentine troops and occupied the city of Córdoba, the capital of the province of Córdoba

Southwest provinces such as San Luis, Mendoza, and La Rioja.

On June 20, the southward column occupied Trencrowen, Santa Rosa, Neuquén and other places, and joined Ye Chenglin's headquarters on June 22.

On 3 July, after Li Dawei and Ye Chenglin's troops successively occupied the Patagonian plateau on the eastern side of the Andes, they divided their troops all the way across the Andes Mountains and landed on the island of Chiloe, quickly sweeping away the weak Chilean Patagonian defenders and occupying the entire area south of Patagonia, including Puerto Montt.

On 4 July, on the grounds that the security of the Chilean region was threatened, the Chilean government forcibly suspended its joint operations plan with the British Expeditionary Fleet and transferred back more than 10 warships, including two ironclad ships, to China to support the operations on the mainland.

On 5 July, the Wehrmacht made a slight rearmament and replenishment, and then directed its forces towards Valdivia, and occupied Valdivia two days before the return of the Chilean support fleet, completing the operational objectives assigned by Li Mingyuan.