Water Troops

[Soyweiser]

It was probably a thug that got the underwater penalties (poor amphbian hurts). And shamblers are surprisingly strong against a lot of single units. Fairly high strength, and lots of attacks.

Not high end heavy infantry. But reasonable medium inf. You either want some eth defense, high protection (with regen etc) or awe to fight them. A defense (or mist form) thug is going to die.