"This ally has attacked your army....

[Knight Templar]

No, diplomacy is too simple in MTW for negotiating with allies about attacking certain province. However, if you invade a province, bigger is possibility your ally will join you.

[miho]

No, diplomacy is too simple in MTW for negotiating with allies about attacking certain province. However, if you invade a province, bigger is possibility your ally will join you.

Is that just if you attack a mutual enemy?

[Vladimir]

The majority of times my "ally" sends an army that's so small and pathetic it serves as a distraction while I send my full army to flank the enemy. I've never been backstabbed in combat before but I'll be looking out for it in the future.

[Just A Girl]

Lol I was stabed in the back by my team mate in mp. :)
2v2 turned in to a 1v1 and 2 spectators,

All through the incident i was saying Stop attacking me.
And she was saying im not :(
I dont understand how she missed the conformation screen, But there ya go,
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As for sp ive never had an ally Attack me in MTW,
But i guess it could happen.
"maby they forgot to add a stat or sumthing"

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I find that The best way to get Suport from an ally in MTW is to be right next to Their province,

They seem to come help defend your province "if there near enough"
It usualy happens if you retreat to your castle and then come out next turn, They will come help releve the seige,

As for attacking people,
I usualy watch where my ally is amassing troops,
And attack the place I beleve they are about to attack.

Aslong as i have the most men I win the province :)

Atleast thats what ive noticed.