To prove his sincerity Zapata required that Guajardo's force capture a town held by Carranzistas. Guajardo's Carranzistas then fought and defeated the other Carranzistas. Guajardo's forces were victorious and to make their conversion more convincing they executed all of the Carranzista prisoners they captured.

Make this lower case.
to prove his sincerity zapata required that guajardo's force capture a town held by carranzistas. guajardo's carranzistas then fought and defeated the other carranzistas. guajardo's forces were victorious and to make their conversion more convincing they executed all of the carranzista prisoners they captured.