Troop Loss

[Xenocide]

 Unless the game has changed, the troop losses have me confused.

I got a message saying:

You held your defense and your enemy was repelled, but you lost:
2 Rats
4 Weasels
14,730 Stoats
3,942 Skiffs
You managed to destroy:
119,753 Rats
16,977 Stoats
16,042 Skiffs

Since I lost all kinds of troops, I would typically assume this is a standard strike.  However, when I look at the news history, it says this was a Naval Assault.  This is also happening with all the different attack type;  Frontal Assault and Guerilla Strike.  Why are we losing all troop types for specialzed attacks?

EDIT:
OK, new addition.  even though the attack failed, it said I lost resorces.  Can someone explain this, it was a failed frontal attack.

You held your defense and your enemy was repelled, but you lost:
741 Rats
4 Weasels
40,235 Stoats
3,916 Skiffs
373,572 Food
3,014,475 Cash
You managed to destroy:
237,822 Rats
34,073 Stoats
16,769 Skiffs