Command & Conquer: "Attack Move" by guarding a cactus.
Test of C&C1 game behaviour: the "Guard Target" function (ctrl+alt+click), used as "Attack Move" (or, more accurately, targeted Area Guard) by targeting a neutral object.
For the purpose of this demonstration, no commands were given to the Mammoth Tanks after the initial "Guard Target" one. I only kept them selected to monitor their health.
Observations:
-As always, the units will only attack units and base defenses, not other base structures.
-The units will not attack the neutral target, which is interesting because units in the game do attack trees if they are blocking their path, and will attack a guard-targeted enemy non-defensive structure because it blocks their destination.
-The units scan the area for hostiles from the moment they enter the area around the object they are supposed to guard. Notably, they attack the enemies before attempting to move as closely as possible to their actual target; the first Mammoth Tank immediately starts firing at the nearby turret.