What caused bolivar leads a surprise attack in 1819

In 1819, the War of Independence in Northern South America was locked in a stalemate. Venezuela was exhausted from a decade of war, and patriot and royalist warlords had fought each other to a standstill. Simón Bolívar, the dashing Liberator, conceived of a brilliant yet seemingly suicidal plan: he would take his 2,000 man army, cross the mighty Andes, and hit the Spanish where they were least expecting it: in neighboring New Granada (Colombia), where a small Spanish army held the region unopposed.

His epic crossing of the frozen Andes would prove to be the most genius of his many daring actions during the war.

do you have options to your question?