In 1900, if Wikipedia is right, the Peruvian army in all branchs numbered 3075 men. Total. Split between 6 infantry battalions. 2 cavalry regiments, and an artillery regiment.
Assuming no great growth in the next 8 years, a very safe assumption I believe, 1000 revolvers would probably be plenty.
If you made it as far as 1890, i'd bet that lasted until ww1. Nothing involving the army happened in Peru until 1911.