I didn't think of that! However, the lack of collateral is sadface. I know I said the best chance, but maybe I should have said it was the best deal. Do you suicide knights against a city? (Only if there are sieges in the garrison maybe?)
sure, you can suicide every type of unit. just try not to lose your high xp units, the rest can be replaced anyway.
an example on my way of attacking a city: (odd numbers are random just to tell and stack attack isn't included, i'm just trying to tell sth)
enemy city has 2longbows w/o promos, i attack with 2 maces (Joe, Jack) and 2axes (William,Avarel)
1) Joe: combat5, 95% odds
Jack:combat4, 85% odds
William: city raider2, 50%odds
Avarel: city raider2, 50%odds
i attack with Joe&Jack. There isn't much risk for them and i prefer them to get xp from war.
2) Joe: combat5, a little hurt, 75% odds
Jack: combat4, a little hurt, 65% odds
William: city raider2, 50%odds
Avarel: city raider2, 50%odds
i attack with william&Avarel. i don't risk high level Joe and Jack. If low xp axes die, Joe&Jack will more easily finish the hurt longbowman and take the city. and they will get the xp.
3) Joe: combat5, a little hurt, 75% odds
Jack:combat4, a little hurt, 65% odds
William:city raider2, a little hurt, 15%odds
Avarel:city raider2, a little hurt, 15%odds
there is no meaning to attack with William/Avarel first. Most probably they will die w/o hurting the longbowman a little. i don't risk any unit. i retreat outside city borders and come back to attack after healing.
but if i believe i have to attack now so as not to let him draft more, i attack with Jack first.
a) If Jack dies, i retreat and to postpone the attack. I come back later with more units. I cannot risk level5 Joe.
b) if Jack kills 1of the longbowman then i attack the last longbowman with axes William and Avarel.
b1)If they can hurt the last longbowman even a little, the odds of Joe will increase. And lastly I will attack with Joe.
b2) If they cannot hurt the last longbowman and the odds of Joe is still ~70/75, i retreat and come back later.