Fighting forest ants part 1
This is the first thing I saw. Lots of ants carrying deceased others or parts of them. By then I asked myself if they had been fighting or something else caused harm to them.
A bit later on I found two ants fighting so that answered my question. Notice that the dead ant is larger then the one which carries him, so it seems the smaller ants where winning from the larger ones.

''Formica rufa'', also known as the southern wood ant or horse ant, is a boreal member of the ''Formica rufa'' group of ants, commonly found throughout much of Europe in both coniferous and broad-leaf broken woodland and parkland.
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