Here's a refresher on Pantano de Vargas:
On August 3, after receiving new recruits and supplies, Bolivar once again began his push toward Bogotá. Expecting this, Spanish General José María Barreiro, headed to Tunja, hoping to block the rebels advance there. However, Bolivar had also anticipated Barreiro's move. He marched his troops toward Tunja not stopping to sleep or rest. On August 5 Bolivar's troops arrived at Tunja. This was long before Barreiro, and therefore, the city was easily taken and secured. The supplies meant for Barreiro that were found there -- food, medicine, horses, and ammunition -- were confiscated and distributed among Bolivar's troops.