Agincourt was interesting because mud (a combination of rain and fresh plowed fields) reduced infantry and cavalry mobility. The opening cavalry charge made the muddy battlefield worse, and the combination of mud and stakes on the ground injured the horses. The French were heavily armored, causing men-at-arms to sink up to their knees in mud. English longbowmen were able fire arrows into the french men-at-arms who were literally stuck in the mud until they ran out of arrows. The decisive moment was when English archers ran out of arrows and attacked the exhausted French with the hatchets and mallets they used to make and drive the stakes into their defensive positions.