The Crystal Dragon will give me the first turn, but there's not much I can do on that turn. I won't be able to block the Titans, and there's nothing I can do about them, because, as I already wrote, the map is at least currently lacking in spells.
Well, somehow this map was completed, including by me. But seriously, the Titans can be blocked. The birds are divided into single units for blocking, a slow spell is cast on them for 1 turn, and morale is applied to the single units so that they can fly over and block the Titan. On the 2nd turn, morale on the birds is no longer needed, because on the 1st turn we moved them closer to the gates. In general, think about it, there are no impossible situations, unless the author intended it that way. P.S. There are probably not enough troops for the battle, so in any case, replay with saving the crystal and as many troops as possible.