Belgium
That makes barely any more sense then Montenegro.
Well those few day belgium was there gave the french a chance to mobelize or elso it would have ended like wwII
Wrong dear, 880 000 men were already in position to fight the war, closely joined by 2 220 000 men. Everybody was especting this war happens, so no, you just confound world war 1 and world war 2.
the august 2nd 1914 the left wing of french army was already deployed in position to defend the french belgium Ardennes border, as far belgium was invaded the 4th of august 1914.
In fact the biggest surprise was the fail of our XIII war plan , not the invasion of Belgium, as far now we know there was an Hypothesis of german invasion of france by the Belgium border which was included in a variation of the XIII warplan. And of course the massive overpowered Germany in terms of mobilisable men ( 9 000 000 vs 4 000 000)
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Russia tend to be the more logical nation after France Britain and Germany (and Italy). But we can add a German's ally like Austria Hungary or Turkey (or Bulgaria).
But we can also do a multi faction type (like in blood and iron) with Serbians, Americans, Russians belgium troops no?
because to me, serbia also tend to be a top important faction of the begining of the war, they defeated Austria very quickly, even if they were outnumbered. And only failed cauz they were a little demographic country with a not very strong war industry. And of course because germany immediatly sent help to Austrians