Imperial Guard sometimes use the warp as part of their strategy and if they become tainted the Grey Knights would have reason to kill them.
it all depends on luck, or the skill of the players, but you need to be specific on your grey knights, what units are they? for example if it was three mechs or something then definitely the grey knights but it might be something weak to
The Nightbringer hands down. The imperial guardsman is just an average soldier, with minimal equipment, where as the Nightbringer is a god, with tremendous power. It's no contest.
Knights FIGHT
HelloThe answer is "that they fight and we also fight in wars like knights!"
AnswerIn theory, most armies can be played alongside, it's just a question of what's sensible, possible, and if you can think of a reason for the fight.Most Imperial forces will fight alongside one another with no issues (Imperial Guard, Space Marines, Witch Hunters, Demon Hunters) with a few exceptions.Tyrannids will never fight alongside anyone, as they are likely to kill everyoneDark Eldar will also rarely fight alongside anyone, expect Chaos.Eldar often fight with most forces, and often against most forces, depending on whether it suits them or not. Orks, probably no one. They fight everything, even them selves. Tau use everyone they can get their hands on.
on a battlefield
Knights fought for the king and lord when they needed their help.
AnswerAt the moment, GW do not make a set of rules for matches like that, so no, 40k armies can not play FB armies.== ==
Unless you are using Night Fight rules, they are useless.
Knights fought whoever was a threat to their lord, whether it be rival knights or raging peasants.
because they whated to inpress the king in tournament
no