Watchtower Guards are White Mantle scouts that man the watchtowers along the Riverside Province mission path. When a party approaches a tower (about 1.5 times aggro range) the Watchtower Guard will alert nearby White Mantle Patrols and they will rush to the tower.
Note that non-ranged skills can be used on the watchtower guards by targeting them while standing at the base of the tower, your character will perform the skill on the tower door and damage the guards. This is because the Guild Wars engine ignores height in some cases when calculating attacks. Actually, using ranged attacks successfully may turn out to be harder, since it is usually hard to acquire a clear line-of-sight to the enemies on the towers. The best way to tackle the tower guards could be using ranged, area-of-effect spells that deal damage over time, as the guards will not have much room to escape.
- Traps work very well against them as they can't interrupt you because their view is usually obstructed by the Watchtower.
- Builds that require conditions to work properly such as Searing Flames are not very good against them as they will use Antidote Signet very often and remove most conditions quickly.