If he sent def to random grey villages without cooperating with his teammates from kingdom who farm a lot, he will have problems with them as well. But if he cooperates with other teammates we can speak about the tactic, not "spiking" as such. In the first case it's clear how to proceed. The second is hard to say, maybe just create a thread on the forum and start crying.
And how can you know if it's some random kingdom less guy or coordinated effort when first thing people do when they red farmlist icon is to go to forum and cry how much spikers ruin game for everyone?
On com2 few of our deffers coordinated with our farmers to spike greys around kingdom BM. We lost next to none off/farming units and had great returns on our def, but that doesn't matter cause not even an hour after def landed entire BM kingdom was crying on forum how spiking is a bs and we should be banned for that action.
It's NEVER seen as a valid strategy/tactic.
"I mean that if they are sending lists every 10minutes then how can you hope to catch them with army home?"
Where did you refer to saved troops in your posts? Twisting words =/= having a good argument. You said when someone is sending FL every 10 minutes, you can't catch their off, because it's not at home anyway. And that's just nonsense, like I said. By the way, many players don't save their troops correctly. Many don't save at all (even decent players), many save them in oasis, and so on. Maybe com is different, but when I recall how many troops we killed at home, because nobody saved them ...
Sorry, I just assumed we are talking about a decent players and possible strategy against them. Of course you can hope that someone is leaving 50k clubs at home and that might work some of the times but if your opponent is active enough to send farmlists every 10min and experienced enough to feed such an army then I'd doubt he is gonna leave his rams/cata or army at home. And yes, COM is completely different ballgame than some local servers.