I'm curious, how have you rated the Martians for SP. Having no firearms makes for a challenging force to play.
They are obviously pretty deadly in combat.
They get 1D6 plus 3 pips for movement. If in charge range they get an extra D6 movement to make the charge. So potentially they can use two action dice plus 6 pips and the extra die for a charge.
They also get to move one action die on the Tiffin card if not already activated. so we make them bloody fast like cavalry in SP. They have to be able to engage quickly otherwise they will get shot down.
They get a saving throw in hand to hand when having taken casualties for their armour and have extra attack die due to spears, glaives,etc.
So far in the games we have played they have been able to charge down the Brits before the Brits have been able to get into position. Having seen the firepower the Brits can deliver in one volley, the Martians can be easily reduced to loosing their bottle.