CREATE TABLE table_18933037_3 (cause_of_loss VARCHAR, bomb_capacity VARCHAR)

When 27 gp h-e bombs the capacity of the bomb what is the cause of loss?
SELECT cause_of_loss FROM table_18933037_3 WHERE bomb_capacity = "27 GP H-E bombs"
SELECT "cause_of_loss" FROM "table_18933037_3" WHERE "27 GP H-E bombs" = "bomb_capacity"