Who has the archer stack right now?

Romich, it's not necessary to use an archer; you can use a griffin for this, and even a fake unit... unless, of course, we're talking specifically about a battle with Valkyrie, who has marks with a speed of 8.

Zhenya, the point is that a two-cell griffin + an archer works even better.
There's also another strategy specifically for War of the Titans. Changing the archer mod to melee attack changes their value for stompers.