they are un attackable for 3 days plus 1 day for each 100 day difference you can`t give them troops or spy on them or just simply attack them to until there protection runs out if you need a example say that i have population 2100 and you have 100 population and you would not be attackable because of the population difference because for each 100 pop difference the person gets a day so if i wanted to attack you i would have to wait a extra 20 days . so the person couldn`t be raided until that added time is done if there isn`t a 100 difference or more he only has 3 days to not get attacked but if the difference is 26 or lower you can attack right now