Technically, slogans are not the same as a motto. Offered in some form of Latin, a motto is more like an expression of a guiding principle, as for example 'Turris fortis meus mihi Deus.' In contrast, a slogan is a distinctive cry (lit. a war cry) or phrase designed to catch ones attention or intimidate, more often provided in ones vernacular. The former to display some degree of cultural refinement, while the later not so much.
How about...
Acquiro Vires Pacum
E Obeditus Unum
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