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The sight of a group of umbrellas all close together in the rain at the epitaph (I think it was, anyway) made me think of soldiers with their shields in a tortoise shell formation.
In this case, they had come together in peace though, guarding from something other than arrows.

Tortoise shell shield

Evil-minionby Ethel Twigg20 Apr 2015

They came together
in conflict
tortoise shell of shields
to guard from the rain
leaks notwithstanding
unity again