If you are interested both in the game of diplomacy and in the real world military history, you would have felt that the game simulates the real world strategy impressively well - except for one moment. In the real life a defender has an advantage, which is not well simulated in the game: in military strategy, in a conventional war a general has to plan for a 3 to 1 advantage if he hopes to displace a fortified defender, whereas in a game it could be 2 to 1, or 3 to 2, etc.

This I had this brilliant idea to add a concept of fortification to the game!

Hear me out. What if a unit could have an option to fortify rather than hold - and then in the next move this unit would count as having a support hold order to it. So next move (or next year) the enemy would have to add an additional attacking support in order to displace the unit.
Of course, if attacked while fortifying, the order would fail, just like it happens with other orders.

The "fortify" order would obviously only apply to land units.

I wonder how that would change a dynamic of the game. My take would be that it would make way more stalemate options, and so more draws - like in real life military history.

What do you think?