While Holmgang doesn't have any specific offensive traps, there are a few tactics you can use to gain an offensive advantage in battles:

Strategic deployment: Place your troops in strategic locations that give them an advantage, such as on high ground or behind cover.  This can make it harder for your opponents to attack you, and give you the upper hand

Bait and ambush: Use a small group of troops as bait to lure your opponents into a trap, where you have a larger force waiting to ambush them. This can catch your opponents off guard and give you a decisive advantage in the battle.

Flanking maneuvers: Try to outflank your opponents by attacking them from the side or rear. This can disrupt their formation and cause confusion, giving you an advantage in the battle.

Siege weapons: Use siege weapons such as catapults or ballistae to attack your opponents' stronghold from a distance. This can allow you to weaken their defenses and soften them up for a ground assault.

Remember, the key to offensive success in Holmgang is to be strategic and adaptable. Study your opponents' tactics, identify their weaknesses, and exploit them to gain the upper hand in battle. Good luck 

Hahahahaha yep what this guy said. 

Air and naval supremacy might be worth to consider aswell, if all fails then tactical nukes is a good last resort.