AT-STs are an ideal unit to deploy amongst infantry rushes, supplementing them with heavier firepower. They're also well suited at being the vanguard for more powerful and specialised units, such as the AT-AT, to help contend with the defenses and defenders; Then utilising their speed to clean out the rest of the base, if the attacker is gunning for a three-star attack, after the specialists have done their job.
However, their short range puts them in the firing range of many defenses, especially Rocket and Burst Turrets, putting a lone walker out of commission. Having a pack of AT-STs will help take them out before too many are lost.On the Defense, AT-STs are one of the most useful infantry hunters; Pounding infantry rushes with higher speed than their slower firing cousin, the AT-DP. It'll take an Anti-Vehicle Skiff to prevent these walkers from pulverising a hopeful rebel infantry rush.