On the day of declaring war, Chile mobilized two divisions to the border regions and announced nationwide mobilization.
Being a country with a decent army, there are currently five divisions of regular troops and 100,000 reserves.
If the nation is mobilized, it could arm at least ten divisions, yielding over 150,000 combat troops.
Due to the proximity of the two nations, Argentina swiftly received news of Chile's declaration of war.
With the situation developing as it has, both nations had made some preparations for war and quickly deployed large numbers of troops upon the declaration of war.
Argentina had made more thorough preparations and some reserves had already joined the army.
At present, the Argentine combat force exceeds 100,000, half of which were located at the Argentine-Chilean border, with the other half on the way.
"Enlist in the army, defend the Motherland!"
"Your great homeland is behind you, fight for your homeland and family!"
"Gentlemen, your country needs you!"
In a short time, recruitment slogans permeated the streets of Chile and Argentina, both nations had mobilized fully.
It's worth mentioning that Argentina's new troops are mainly equipped with the M1903 Springfield Rifles, whereas Chile's new army is primarily armed with Lee-Enfield rifles.
The commencement of the war in South America was quickly broadcasted globally.
At this time, the White House in the United States was led President Wilson, who had only been in office for a few months.
On July 4, 1913, one day after the outbreak of the South American war, the British Empire formally stated that Argentina has exhibited shameful aggression in this war, posing a significant threat to Chilean territorial security.
To maintain peace and tranquility in South America and reduce further casualties, spreading peace around the world, the British Empire announced that it would provide military aid to Chile, along with an interest-free loan.
At the same time, American aid was transported to Argentina.
To avoid offending the British Empire after the war, America had specially renamed its support. On the surface, it was Argentina buying US armaments, and the order was signed before the war.
With the backing of the major power behind the scenes, the war between Chile and Argentina became even more intense, evolving into a ferocious conflict along most of the border.
It is proven that Argentina, who had prepared for war in advance, did indeed gain certain advantages in the early stages of the war.
Within just one week of the outbreak of the war, Argentina had advanced several kilometers forward on the border, eliminating thousands of Chilean soldiers.
Although Argentina also suffered heavy casualties, by virtue of numerical superiority, it had gained certain advantages on the battlefield.
This war between the two nations involved heavy weapons, including firearms and heavy machine guns, causing substantial casualties for both sides.
For the British Empire at this time, the war in South America was more important than the Balkan War, and Britain was prepared to get involved at any time.
The British Empire did not have many interests in the Balkan region, most of which concerned the Austro-Hungarian Empire, Russia, and Italy.
As long as Constantinople is not threatened, the British Empire can accept whatever happens in the Balkans.
But the situation is different in South America. Chile is the main strategic partner of the British Empire, and also the world's largest exporter of saltpetre and saltpetre products.
If there are problems with the situation in South America, it is unacceptable for the British Empire. Especially, if America gains control over South America, it would become an invincible nation.