Otherwise you will need to use the “Stun” technique which is tricky. If you did not have a “Concentration voucher” then I would send a big bloke in earlier to ensure you have “Smash/Bash” when Arrnold descends.
Even so we only just got our big blokes in before Arrnold came down. With this combo we used a “Concentration” voucher to make sure they were all hungry. We invaded with the crew as below, in this order: Party Z, Zombee, Zombilocks, Robo Z, Flamehead, Zombilocks, Robo Z, Zombilocks, Robo Z, Zombutterfly, Skull head, 2 Zombilocks, Zomviking, Imp, Zombarian. We invaded late at Level 33 with a well mutated army of Red Zombies along with some Specials thrown up by the Zombie Pot. There are a lots of combinations that will work but below are some of our experiences and a winning combination. Use something to stop Arrnold’s big hits from landing.Send in 1-2 healers with at least the heal ability.If you want to win with no losses you need Red Zombies.We found leading with a headless or 2 worked best.Using Bash/Smash seems safest to us since your timing is less important and we prefer not to use the “Explode” suicide Mini technique. Some people use Bumpkins with a mini-buddy to stun Arrnold, others use Mini’s with the “explode” Ability while others use the Bash/Smash Ability. With a red Zombie army there are various ways to win, depending on your preferences and the Abilities your Zombies have. We found that while you could win against the Pirates with an all blue army, we couldn’t do it without losses. He hits hard enough to kill most Zombies, so you need some strategy or Ability to defuse this. Secondly, the Pirate Boss, Arrnold, hits very hard but throws slowly. The 2 things that will catch you out are firstly that the minions hit at the pace of your first Zombie therefore make it a headless so they hit slowly. Unlike say the Circus, where you have a new hazard in the trapeze lady, there is no special hazard at the Pirates. The Pirate Invasion is a bit different because it is the first one where if you get it wrong, you can easily lose all of your Zombies. We did get all our Zombies into the fight. We were at level 34 and so most of our crew had lots of mutations up to Flytrap and had all their Abilities. We used, in this order: Skullhead, Party Z, Zombutterfly, Robo Z, ZomViking, Zombielocks, Zombot, Zombotron, Zombielocks, Robo Z, Zombutterfly, Zombielocks, Falmehead, Robo Z, Imp Z, Zombielocks. We had the Blue & Red graves and had some luck with the Zombie Pot cooking up mutated Zombies. This is another invasion that worked with no losses, but on this farm we only had 16 Zombies. We won with no losses using this Zombie crew in this order: Flamehead, Party Z, Zombotron, Amazombie, Zombutterfly, 2 Zombotron, Zombutterfly, ZomBrusier, Party Z, Amazombie, Zombot, ZomGoblin, Zombee, Zomviking, ZomGoblin, Flower Z, Culiflower Z, Flower Z, Zombarian. We did have the Zombie Monolith which gives you 20 Zombies and we got all 20 into the fight just before the end. Most of the Zombies had Dragon Fruit, Flytrap, Cauliflower & Garlic mutations but we had not unlocked the Eyebiscus mutation. So any Special or Silver Zombies had been cooked up in the Zombie Pot. We had the Blue and Red graves but not the Silver one, nor had we bought any Special Zombies for brains. With the Zombies below we had about 40 seconds left when we won. Do tap on the carrot wall to help out your Zombies.The order you send your Zombies in seems relatively unimportant.Since we did not want to lose all of our Zombies, we have not tried this to date. You can leave your Zombies to batter away at the carrot wall(s) but unless you have very, very special Zombies, which we do not, then you will run out of time and face a “Do or Die”. However you do get a “tap” hint and that is what you need to do tap the carrot around 20 times to shrink it. The new hazard is the carrot wall that appears in front of your Zombies, preventing them from attacking.
There are no major difficulties or tricks here. The Ninja invasion is usually not that difficult, at least in comparison with the Pirate invasion.