I wouldn't take any aggressive action toward dtay. We don't need another enemy, and we can't really stop him from landing Taj, just delay him. It's an extremely risky play for little-to-no gain, so it's goal is only the deprivation to an opponent of one city or a few workers, without anything more substantial won for us. I am very strongly against this play. I advise you to focus on the main chance, which is using overwhelming force to seize a substantial amount of land from a chosen target. Please, don't commit us to a war by half-measures or without hope of significant success. 