When you claim this expedition, if you control a Dirigible, ready each Glider you control that was dispatched to it. Each of them deals 1 damage to the opposing mothership.
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Explained
When you claim this expedition, if you control a Dirigible, ready each Glider you control that was dispatched to it. Each of them deals 1 damage to the opposing mothership.706.6, 301.7
It happens for the player who claims it, whoever launched it, and at once: claims happen in the battle step, after the crew destroyed there are gone (706.6). Only with a Dirigible of yours on board, anywhere. Only your Gliders still in this expedition's battle count: the ones destroyed there are gone, and ones sent there in earlier turns don't. They become ready, so they can defend in your opponent's next sortie. Each deals the damage on its own, so a mothership that reduces each source takes it from each (801.15, 706.6b).
Distance 5 · Spoils 2304, 706
Crew dispatched here on their own turn make progress, whoever launched it; on the opponent's turn they can only fight (706.3a). The first player to reach 5 progress claims it and gains 2 spoils.