Tactics against the Tower.

Tower, given its specifics, is a pleasure to rush, so the conclusion is obvious - Stronghold. Especially since the map is only L.

Oh, you're a joker. "Rush." On the first week, it's better not to show up in front of Solmyr at all, because it's obvious he'll kill the entire army with one Chain Lightning.
On the second week, it's also advisable to avoid the encounter; it's better to focus on Griffins and squires.
Well, and then look towards the Iron Golems. Artifacts for the specialty hero. Or just Tactics + Mass Haste. And that's it.

»» I have 10 Attack and 1 Knowledge by month 2

This only goes to show that you're a noob. Watch streams and improve.
The problem isn't how to play against Tower, but how to play Tower itself against other factions. On large maps, it's particularly difficult for it.