Hello. Thanks all. 

@Atrik I didn't know it works after Call to Arms, thanks. 

Thanks but that's not needed to do it manually. The account limitations are lifted after enough content is posted.  Welcome @vanz!

"Back to Work" => 'Y' by default

Maybe wrong thread because this is not really a discussion? Anyway, in the Hotkeys options there is an unassigned key for "Call to Arms". Assign this key to Backlash or some other convenient key.  When under attack, select all your soldiers (but not women) and use this hotkey. The sword icon will show up. Right click to a place where you want all selected units to attack move after dropping off resources. Ring a bell from civic center to make your women garrison.  After the attack, send all soldiers to chop wood, then immediately assign some of them to stone or metal, if needed. Don't forget to send the women back to work by clicking the gray bell on the civic center. 

How to quickly call all soldiers for a battle when under attack, and then reassign them when the defense is successful? As far as I see, bot can do this easily when I always lose because my soldiers are always parted. 

This should be really easy for you self diagnosis and correct. Just look at the idle worker count in the bottom right corner of the mini map. If the number is above 0 then you made a mistake. Keeping an eye on this counter, pressing the period button to find the idle worker, and assigning a task to the idle worker is eco management 101.