Some luck definately is involved
Changed type of mortar to HE (High Explosive),
chose map Suez
in Operations mode, part of attacking team
try two shots, and both of them was a kill, just like that
In Monte Grappa, part of definding team in Operations,
lots of eneniems walking around, zero kills in 15 shots
What is also weird is that I cannot pick up the mortar again
It says the key is whitespace, but that is not valid
There's some bugs in BF1, one of them is the fact that if you change some keys, the displayed help information is not following that and shows the default key
So, the only way I cannot loose the mortar (left behind if you don't pick it up), is to use all mortars (5) and then run away