a line of villagers in the 4th row, placed down as early as can be safely done, with 3 rows of archers behind them and shield bros 2 rows ahead of the villagers (leaving a row open for late game wizards) does the trick. You can use mines to protect vs the first girl, then archers with 3 attack upgrades can take out any additional girls before they take out a villager so long as you drop them promptly. From there it's just a matter of steadily adding archers and shield bros until you are all set up and filling in the wizards, with barrel bombs for the big waves and mines if ever needed.
no you do the last line as villagers the two lines before that are the single shot and double shot archers have the shield Bros ahead of them in a row and then have the explosives ready so place the landmines in a row ahead of the shield Bros and then the barrel used for emergencies and clearing out massive droves of enemies at once only