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The Martin Baltimore II differed from the Mk I only in that it was delivered
with two 0.30in Browning machine guns in the rear dorsal position in place of the single gun of the Mk. I. Neither installation proved satisfactory, and in most cases was replaced by a British version, using 0.303in Brownings. 100 Baltimore Mk.IIs were delivered as part of the first British order for 400 aircraft, following 50 Baltimore Is. The Baltimore II was used by five operational squadrons, four of which also used the Mk I.