Infantry are the foot soldiers, and have lower speed than the mounted Cavalry. The defensive capabilities of Travian units vary between infantry and cavalry. If sufficient strength of force can be mustered, the lower speed of infantry units makes them a good accompanying force for siege weapons, as the speed of cavalry would be wasted.
To begin using infantry units, a Rally point and Barracks are required, and only the lowest infantry unit can be made without further research.
All infantry have an upkeep cost of one crop or wheat per hour, compared to 2, 3, or 4 for cavalry units.
Each race has a different group of infantry units, with different strengths and weaknesses..