sj22319002 said:

Spent a lot of time in game ...many alliance contain a special base that stay under protection all the time ...

Suggestion : I think game Developers should add a special rank base that stay under protection all the time ...and for that protection Generals and Marshal should pay diamonds ...  

"Safe House"

Hi! Most likely that such a base belonged to a person who passed away and his/her Alliance-mates asked for protection for that base.