Do you mean that you need a *plurality* of units (more than any other space)? In other words, is 3 units in the Victory box, 1 unit in the Draw box, and 2 units in the Defeat box a Victory or a Draw?
I might be wrong, but I've always understood it to mean in which box is there the most units. And if there are two in each, then it's draw.
2. One event allows the player to besiege a fortress 'for free'. Can this be a fortress behind enemy lines? If so, what happens on the next activation if I take over - does the army move back and besiege it?
I don't think you can besiege a fortress behind enemy lines period. That would nullify your second question.
But I'm not 100% sure! Paging:John Welch