Is the last German mission winnable?

[Silencer]

I couldn't hold the first line, but stood my ground a the second line.
With the 2 extra flaks 88, the small flaks. those helped a lot. and save your mortar, helps tonnes.
use a scout car to transfer ammo from the back.
in the end, i noticed the where heavy artillery guns, but I didn't use them.

When the missiong stops; I had 3 pvIVG, 1 tiger, 2 flaks en several captured allied tanks; 2 churchill VII heavies -->They don't have a heavy gun, but heavy superb armour.

only thing i couldn't do is do destroy the rockect launchers in time, in the mini-mission. I alway manage to get 2, but before I can kill the last one, it start's firing. any help here?