none of them, my mistake. I meant the one at (72,3)
Lancer: Am I getting these suggestions right? The one I'm using may be a spear rather than a lance, but it does seem more suggestive of the job (at least, to me).
sorry, lance or spear are translated as lance in French, so I don't know the difference.
Princess: HG seemed to be against this one in a. I'm checking that I read your coordinates right; if so, I'll go with column c.
in c. you mean the Fortress with a Rook on top of a Rook? That is a terrible choice for a BN.
If these are the ones you mean, I really prefer medieval siege engines over modern tanks.
Musketeer has several siege engines icons. I understand your reluctance for a tank incon, but then, why do you call it a "tank" if you don't want a tank? You may call it otherwise, Trebuchet, Onager, Catapult, Ballista, ...