The Siege Tower is a slow-moving unit that can only attack buildings with the primary attack.
However, the Siege Tower can attack other units with the secondary attack, provided that the siege tower is garrisoned. The more units garrisoned the more damage. Type of Units garrisoned inside do not matter.
It can only use one attack at a time. Once it's ramming buildings, it might be preferable to unload garrisoned units to fight normally. This can be particularly effective with Sappers.
The Siege Tower can garrison 12 units.
Babylonian Siege Towers have an enormous amount of HP with their champion upgrade.
Garrisoning lower health units inside can provide the Babylonian Siege Tower with a good area of effect pierce attack while keeping your units alive.
If low on resources, Shield Bearers and Bowmen are cheap options to fill up Siege Towers, though Villagers also work.
Units inside a Siege Tower are not lost when it's destroyed. If a Siege Tower is converted by an enemy, garrisoned units are automatically ejected and not converted alongside it.
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