[Tuidjy]

> The arbalests are decent infantry.

Yes. If they had a buckler, they would be good infantry. Unfortunately,
that's not allowed, not for Ulm.

> I either used arbs with cheap troups, or more often infantry with cheap archers.

You have the right idea. Heavy infantry with the "resource three" archers you
get from Druid provinces is a very nice combination against indies and AI.
And of course, the druids' relief was very useful in Dominions II, where druids
could boost themselves to N3 trivially.