Although the Mexican Border Patrol put up a desperate resistance, the 2,000 men could only sit back and wait in the face of tens of thousands of American troops who had long been ready for battle.

It took at least a few days for scouts to reach the nearest Mexican camp for help, and one to two months to reach the capital, Mexico City.

The generals on the other side of the U.S. military were told that at least hundreds of millions of dollars worth of gold were waiting for them in California.

As a result, the Yankees advanced very quickly, and only sent a small number of old and weak soldiers to besiege the strongholds and barracks encountered on the way.

Of course, most of these Mexican soldiers did not fight, and almost all of them chose to surrender before fighting.

Being a prisoner of war is not a glamorous thing, but it is a common occurrence for Mexican soldiers, whose country has had more civil wars than it can count.

But the Americans weren't going to take these guys into their army, but they weren't going to let them go, as Napoleon did.

The fate of these Mexicans was broadly divided into two categories: being driven as cattle with the American military units, and being sold into slavery to local American immigrants.

It's just that the price of these white Mexicans or mestizos is not comparable to that of black slaves, and they are usually sold for only about $30.

It took less than a month for the U.S. military, advancing along the 37th parallel, to reach the California region.

Even more striking is the speed of the Mexican army's reaction, which has been defending against possible Texas attacks for nearly a month after the war began.

On the French side, Louis Philippe was strictly on the move, and only Guizot tried to take advantage of the opportunity to get a piece of the pie.

But he soon realized that both the United States and Mexico were on the defensive side of France. Only this time Guizot thought that Louis Philippe was right, and that it was really not appropriate to join the war at this time.

Although the focus of the U.S. offensive was Austrian-controlled California, after all, the invasion was a territory belonging to Mexico, and Tasan Anna decided to lead his troops north to "regain lost territory".

Fierce fighting broke out between the two sides over the Rio Grande. The Mexican army was seven times larger than the American troops stationed there, and as a result, Tasan Anna remembered his previous tragedy, and he refused to send superior forces to attack, but chose to engage in an artillery battle with the enemy.

However, the American forces at this time were no longer what they used to be, and they abandoned the previous small-caliber artillery and old cast-iron guns in favor of expensive but efficient bronze guns.

In fact, the bronze cannon at that time was much better than the cast iron cannon, and could even compete with the Austrian steel cannon. The U.S. military purchased 98 6-pounder bronze cannons in 1838, and since then has been purchasing large quantities every year, and by 1844 the number of bronze cannons in the U.S. military was close to 350.

The Mexican army used antiques made by Austria and Britain during the Napoleonic Wars, and these old cast-iron cannons were as dangerous to themselves as they were to the enemy, because they were very easy to blow up, especially when firing continuously.

The American troops stationed at the Rio Grande were armed with nearly 80 bronze cannons, and soon suppressed the Mexican army, which had 150 guns.

Artillery battles are brutal, and the bronze cannon can add more gunpowder due to its better malleability, and the cannon is discharged faster and has a higher hit rate.

So he had the advantage in the artillery battle, and at the same time Tasan Anna did not allow the cavalry and infantry to charge, which greatly damaged the morale of the Mexican army.

This kind of fighting was a torture especially for the strong-blooded Indian soldiers, who were not afraid of death, but were not accustomed to being slaughtered by name.

Thankfully, the Mexicans succeeded in eliminating several of the American supply convoys, and the pistols were again defeated by the light cavalry in a short encounter.

However, this cannot be blamed on the pistols, since the Mexicans had two cavalry divisions, while the American convoys had at most one or two companies.

But these victories were not enough to encourage and prevent a pessimism from spreading among the army, and Tasan Anna realized that this would not work.

He remembered what his idol had done in 1812, and by night the Mexican army had left enough campfires and quietly withdrew from the battlefield.

Bright bonfires instead became the main culprit in the cover-up, and yellow fever had already broken out in the US military camp at this time.

Due to the excessive mosquito activity in the summer, and the fact that most of the people who went to Mexico this time were "northerners", they were completely inresistant to the virus, so a large number of soldiers quickly lost their combat effectiveness.

Yellow fever is an acute infectious disease caused by the yellow fever virus, mainly through the bite of the Aedes mosquito. This disease has a very high mortality rate and is highly contagious, and even today there is no specific treatment, and the fight against this virus is mainly based on prevention.

Historically, this kind of death claimed the lives of nearly 10,000 Americans during the Mexican-American War, when the number of American soldiers was greater and the sanitary conditions were worse; And the choice to camp by the river and send troops in the summer greatly increases the risk of contracting the virus.

When the Americans discovered the Mexicans withdrawing the next day, the American generals and his lieutenants embraced each other to celebrate the aftermath of the Massacre while declaring that they had won the battle at the Rio Grande.

Although there are still thousands of corpses of the American convoy on the road not far away, the withdrawal of Mexican troops is the best proof of this.

At the same time, Tasan Anna declared himself the winner, as he blocked the Yankees in the barracks for a week, eliminated several American convoys, and captured several flags, so Mexico was the real winner.

Both sides felt good about themselves, but the war did not escalate further, and first of all, the American vanguard led by General Taylor was to hold the supply lines.

The Mexican side naturally knows how bad yellow fever is, and those mosquitoes don't just bite the Yankees.

Tasan Anna was anxiously waiting for his own enough mosquito nets and doctors to be transported to the front, otherwise he knew exactly what would be the next step for him; After all, it is not once or twice that this virus has broken out in the camp of the Mexican army.

On the other hand, the first American soldiers to arrive in California were stunned by the richness of the land. In fact, after many years of operation in Austria, it has become an oasis of abundance.

In fact, the land in California is already very fertile, which is very suitable for agricultural production. On the one hand, Austria could not live by killing bison and eating beef every day, which was a primitive hunter-gatherer, and there were more "laborers" on hand, so they started farming.

Of course, this strategy of emphasizing agriculture in California was also instructed by Franz, who knew that this would be one of the most important granaries of the United States in later generations.

This is also a sustainable development strategy, as non-renewable gold mines will be depleted sooner or later.

By this time, the first American soldiers to enter the California area had become underground miners, and they could finally see the dear gold.

It's just that they need to take it out with their own hands and then hand it over to someone else. In this situation, how cruel is it.

(End of chapter)