1819
Battle of Boyacá
The setting
Boyacá River, near Tunja, New Granada (present-day Colombia)
River crossing and bridge with broken, hilly ground
Reveal the outcome
Recorded sidePatriots (Gran Colombia)
Recorded resultDecisive victory
Patriot victory; Bolívar cut the royalist vanguard off from its rearguard at the bridge, captured Barreiro and most of his force, and opened the road to Bogotá, securing the independence of New Granada.
How the atlas explains it
Coming off the grueling crossing of the Andes, Bolívar surprised the royalists and used the terrain to drive a wedge between their separated vanguard and rearguard at the river, defeating each in detail and collapsing their cohesion.
What followed
Effectively liberated New Granada and gave the patriots the base and momentum to consolidate Gran Colombia.