Yes...recall Machiavelli's comment upon mercenaries.
Quote:...if one holds his state on the basis of mercenary arms, he will never be firm or secure; because they are disunited, ambitious, without discipline, unfaithful; gallant among friends, vile among enemies; no fear of God, no faith with men; and one defers ruin insofar as one defers the attack; and in peace you are despoiled by them, in war by the enemy.