In the first 'ambush' mission, where bandits attack from all directions and you have to protect your tent - both Emma and Sabrina's weapons broke for the first time, I walked them back to the tent, dragged a sword onto each, clicked their inventory, selected 'equip' - and then moved them up to attack nearby enemies. However, neither of them (one holding a rusty sword, the other holding a wooden sword) had an 'attack' option - even though when I checked each of their inventories they each had their sword equipped.
I had to de-equip and re-equip each sword before the slash attack would reappear.
I had to de-equip and re-equip each sword before the slash attack would reappear.