On 18 September, the British side sent a diplomatic note to the United States, demanding that the United States explain the dispatch of the main force of the Atlantic Fleet and the holding of a secret meeting with the Brazilian Republic.

The next day, the U.S. side reiterated the position of the Monroe Doctrine and refused to disclose to Britain the true purpose of sending the Atlantic Fleet to hold secret talks with the Republic of Brazil.

On September 20, the United States followed the Republic of Brazil with a statement emphasizing that the secret talks between the Republic of Brazil and the United States were normal commercial cooperation and would not jeopardize the economic interests of the United Kingdom in the Republic of Brazil.

The Americans' self-directed posture and the ambiguous answers of the Brazilian Republic did not satisfy the British and Han countries, but while the British and Han countries were in contact with each other and discussing with each other and preparing to take further countermeasures, the situation on the battlefield in Paraguay changed dramatically because of the sudden fall of Asunción.

Six days earlier, at noon on September 14, 1889, a reconnaissance force from the Brazilian Republic had discovered the headquarters of the 1st Division of the Paraguayan Army, and on the afternoon of the second day, a Brazilian army of about 14,000 men had bypassed the frontal line and moved to a forest about 17 miles away from the city of Asunción, where it was ambushed and waited for the arrival of the 1st Division of the Paraguayan Army.

At 6 p.m., two hours after the movement of the Brazilian Republican army had moved to the eastern outskirts of Asunción, the headquarters of the 1st Division of the Paraguayan Army, which had been marching for a long time, arrived at the predetermined ambush site.

The 1st Division of the Paraguayan Army has a total of about 7,000 people, of which nearly 5,000 are combatants, and the total number of soldiers is only half of the number of soldiers on the Brazilian Republican side.

At 6:47 p.m., when the battle had been going on for more than 40 minutes, the casualties of the 1st Division of the Paraguayan Army had rapidly risen to more than 600, and about 2,000 Paraguayan soldiers had been divided into several parts and lost contact with the main force of the 1st Division because of the sudden onslaught of the Brazilian troops.

At 7:03 p.m., after the initial blows of the battle, General Engorodes, commander of the 1st Division of the Paraguayan Army, urgently organized the troops he could command, set up defensive positions on the spot, and tried to gather and rescue the troops that were divided and encircled.

The first division of the Paraguayan army is the most elite military force in the era of López Jr., in order to guard against the possible threat of Han, López Jr. has been deploying the first division in the border area near the Han State, however, after the death of López Jr., the first division has lost a strong military leader and spiritual leader, although under the leadership of the division commander General Engerodes, it can play a normal level of response, but there is no longer the spirit of the López Jr. era, which is outnumbered and tenaciously fighting.

At 7:29 p.m., General Engorodes' rescue operation was a complete failure, not only were the more than 2,000 soldiers who had been divided and besieged not rescued, but also the casualties of the 1st Division of the Paraguayan Army increased by more than 400 in the process of organizing a temporary counterattack.

At 7:52 a.m., the consequences of the 1st Division of the Paraguayan Army, which was running out of ammunition and heavy weapons, gradually became apparent, and the 1st Division of the Paraguayan Army was in danger of being encircled under the offensive of the steadily advancing army of the Brazilian Republic.

At 8:01 p.m., seeing that the operation to rescue the divided troops had failed, in order to avoid greater losses, General Engrodes could only make the decision to abandon the divided troops and choose to lead the remaining troops to break out.

At 8:37 p.m., Engorodes led about 3,400 Paraguayan soldiers to break through the blockade of the army of the Republic of Brazil and successfully break through the siege, while the remaining 3,000 soldiers were completely encircled by the Republic of Brazil.

At 12 o'clock in the morning, the fighting in the forest valley on the eastern outskirts of Asunción gradually ceased, and in the evening, the Brazilian Republic, with twice the strength of the Paraguayan army, won the battle, killing and capturing more than 3,200 soldiers of the 1st Division of the Paraguayan Army (some of the encircled soldiers fled to the forest to hide), and more than 2,600 casualties on its side.

On the Paraguayan side, although the first division of the Paraguayan Army escaped the fate of being completely annihilated, the main force lost more than half, and the remaining troops lost the ability to reinforce the defenders of Asunción.

After the Battle of the Forest Valley was over, the army of the Brazilian Republic, having cleaned up the battlefield, set out at 8 a.m. the next day to return to the front line in Asunción.

At noon on 16 September, the troops of the Brazilian Republic, which had ambushed the headquarters of the 1st Division of the Paraguayan Army, arrived on the front line in Asunción, and they returned to Asunción with nearly 3,000 prisoners of the 1st Division of the Paraguayan Army.

When the captured soldiers appeared in the open space outside the city walls, the Paraguayan defenders in Asunción panicked instantly.

The First Division of the Paraguayan Army is the most effective and the last regular army under the command of the Paraguayan high-level in addition to the Han army, and now, the Han reinforcements have not yet arrived, and the First Division of the Paraguayan Army, which they have high hopes for, has been "wiped out" by the Brazilian Republic.

At 7:10 p.m. on 16 September, the army of the Republic of Brazil uncharacteristically chose to attack the city of Asunción at night.

At 8:30 p.m., the army of the Brazilian Republic successively strengthened its front-line offensive forces, and the number of soldiers directly used to attack the fortifications of Asunción exceeded 20,000.

At 8:59 p.m., the last highland defense line outside Asunción was lost, and the Paraguayan soldiers stationed on the highland defense line were killed in battle, and the remaining nearly 500 soldiers all chose to surrender to the attacking troops to end the battle.

At 10.47 p.m., the army of the Republic of Brazil, with the help of artillery, launched a third large-scale attack on the defenders of Asunción, taking advantage of the captured heights and the artillery deployed on them.

Artillery fire roared, ammunition rained, and the defense of the Asunción walls, which had been devastated by months of fighting, crumbled like decaying old trees, under the all-out onslaught of the army of the Brazilian Republic.

At 11:02 p.m., the first large-scale clash broke out between the four-member Regency Council and the rebel coalition in the residential city, and the top brass of the two sides fought to the point of guns over whether to hold on to their differences over Asunción.

At 11 o'clock at noon on September 17, the Brazilian Republican Army concentrated its heavy weapons and continued its offensive against the Asunción defensive front.

At 3 p.m., after nearly a day of fierce fighting, the army of the Brazilian Republic, at the cost of more than 3,000 casualties, advanced the front 290 meters, and the forward artillery positions broke through to within 700 meters of the Asunción city wall.

On 18 September, as the tide of battle continued against the defenders of Asunción, the Army of the Republic of Brazil suppressed the counterattack of the Paraguayan soldiers with artillery fire and inflicted a sustained heavy blow on the side of the defenders of Asunción.

At 10 a.m. on September 19, the army of the Brazilian Republic advanced to within 300 meters of the fortifications of the city.

At 12 o'clock in the afternoon, under the bombardment of Brazilian artillery, several gaps in the fortifications of Asunción with a width of more than 50 meters appeared. At 1 p.m., a Brazilian army of about 600 men crossed the gap and advanced into the city of Asunción.

The city of Asunción was well fortified by López's father and son, so when the army of the Republic of Brazil invaded the city, the retreating Paraguayan army quickly used the fortifications to form new defensive positions.

At the same time, Han forces arriving in Villarica also launched an attack on the Brazilian army, hoping to crush the enemy forces in front of them, and quickly march towards reinforcements on the Asunción side.

However, in the face of a salvage situation in Asunción, in order to preserve the vital forces and prevent the troops from suffering a devastating blow in the course of the battle with the army of the Brazilian Republic,

The four-member Regency Committee's troops, who were always wary of the rebel coalition side, were the first to evacuate the city's defenses without informing their allies, and took advantage of the cover of night to flee in the direction of eastern Asunción with López Jr.'s son Carlos hostage.

The soldiers of the four-member Regency Council withdrew without authorization, and there were holes in the defense line of Asunción, and after sensing the actual situation of the emptiness of the defensive front on the opposite side, the Brazilian army quickly adjusted its military deployment and advanced along the various defensive lines.

At 11 o'clock in the middle of the night, the inner defense of the city of Asunción completely collapsed, and nearly 10,000 Paraguayan soldiers who had learned the news of the withdrawal of friendly troops, in horror and resentment, fled along the evacuation path of the headquarters of the four-member regency committee towards the east of Asunción, the only place not controlled by the Brazilian army.

Losing the command of officers at all levels, nearly 10,000 Paraguayan soldiers swarmed in the direction of the eastern suburbs of Asunción, only to fall into the trap of death under the superior deployment of the army of the Brazilian Republic.

At two o'clock in the morning at midnight, also in the eastern forest valley of Asunción, the embarrassed Paraguayan rout encountered a pre-ambush by the Brazilian army, unlike the last time the first division of the Paraguayan army was ambushed, losing the protection of the fortifications in the city of Asunción, and facing the two directions of Asunción and the forest valley, the superior enemy army continued to ambush and pursue, and the Paraguayan rout, which had been in a state of engagement for several months, was mentally and physically fatigued, completely lost the struggle and held out for less than two hours. He quickly laid down his arms and chose to surrender to the Brazilian army in a humiliating way.

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