Lord of the Glittering Caves: Gimli gets +1 for each minion that is assigned to a companion or ally. Minions are unassigned once their skirmish has been resolved or those that can't be assigned (like some versions of Saruman). 'Skirmishing' is a whole other matter. Don't get those two confused with one another.
Let's say you have 5 companions and your opponent has 3 minions. You assign each of those to an eligible character of yours and begin with Gimli's skirmish first. Gimli now gets +3 strength.
Unheard Of works the other way around. You do Gimli's (with damage+3) skirmish last, win, play
Unheard Of which lets you wound one of the other two minions 3x.