The caused great difficulty in fighting in vietnam.

The jungle terrain and bad weather made it difficult for the American forces fighting in Vietnam. This is because it allowed the Vietcong to successfully use guerrilla warfare strategies and to lay traps. Later, tunnels were found under the jungles which helped them avoid bombs

post the grid otherwise i cant .

also it sounds like a math question not history.

i believe that the correct answer is a canadian hero.

explanation: he is celebrated as a national hero in canada for successfully thwarting a united states takeover of canada during the war of 1812.