@ramazan - you can literally do it with just 1 soldier tho. You just need to block the bottom (the spot phylis blocks in lafate's video) and place the prince faster. You don't need the 2 soldiers for blovk , nor do you have that much need for 2 up generators (sure , having up early helps , but the map is not so tight on up that you need 2).
At least i 3stared it with just 1 soldier..