Turn Block

The turnblocking works like this:
Chance to turnblock = to the difference between you and your enemies troop counts
Chance % = your units count / opponent units count
Example:
You have 3 Militias and your enemy has 10.
3/10 = 30 % Chance
This will work upto a max of 50%. So even if you match or send more troops than your enemy, there is a 50% chance he will avoid.

That is unless your priority is higher than them, because then the chance to turnblock doubles so with the same situation, yet you moving before the enemy does.
In the Example
(3/10)*2 = 60%
This will work upto a max of 100%. So 50% of your stack will block the enemy, so turn priority is still important if you know your enemy has a large stack near to you.

You can check more information here

Hoe did a player block 35 tanks with only 5 or 6

Napisao DevinMcclanahan, 09.03.2016 at 20:29

Hoe did a player block 35 tanks with only 5 or 6

Nice necro....
Lao has a nice tb explination, check it out http://atwar-game.com/forum/topic.php?topic_id=16145