@ Notmucheyecandy: Setpos is okay, but the soldiers fall down when they duck. I put them on a lighthouse where the balcony is very narrow. So I had to use palettes or something to allow for room for ducking.
@ All: I fixed the problem meanwhile using a script
# Loop01
Palette Setpos [(Getpos Palette Select 0),(Getpos Palette Select 1), Hight]
Palette setdir 0
Palette setvelocity [0,0,0]
~ 0.001
goto "Loop01"
exit
Setvelocity helped a lot...