German submarines also targeted Brazilian merchant ships during both World Wars and, twice over, precipitated Brazil's decision to give up its neutral stance and declare war on Germany. The primary targets of the U-boat campaigns in both wars were the merchant convoys bringing supplies from Canada and other parts of the British Empire, and from the United States, to the United Kingdom and (during the Second World War) to the Soviet Union and the Allied territories in the Mediterranean. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic-warfare role ( commerce raiding) and enforcing a naval blockade against enemy shipping. U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. U-995, a typical VIIC/41 U-boat on display at the Laboe Naval Memorial JSTOR ( September 2022) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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