The list of units
Mechanized infantry are fast-moving defensive units that will withdraw from combat if losing (unless fighting another fast unit).
A city must have both oil and rubber in its Strategic Resource box to build mechanized infantry.
The introduction of armored tanks meant that armies could quickly break through enemy defensive positions and move aggressively forward on the battlefield. Such a quick advance, however, left the ground won in the advance largely undefended. Mechanized infantry, which was first used during World War II, was designed to move in quickly and defend the conquered area behind the tanks. Infantry were mounted in armored vehicles, such as half-tracks and Armored Personnel Carriers (APCs), to carry them quickly and safely along with the rapidly-advancing armored divisions.