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Last one Pork Chop Hill (1959), thanks for the animal clue.
#300: The enemy below (1957)
298 Mystery Submarine
299 is kinda tough. I think it is The Valiant (1962). The only image I could find was on this Italian sitehttps://www.filmtv.it/film/143/l-affondamento-della-valiant/I saw this ages ago on late night TV.
''The Valiant is a 1962 British/Italian international co-production film directed by Roy Ward Baker and starring John Mills, Ettore Manni, Roberto Risso, Robert Shaw, and Liam Redmond. It is based on the Italian manned torpedo attack which seriously damaged the two British battleships Valiant and Queen Elizabeth and the oil tanker Sagona at the port of Alexandria in December 1941.'' ( Wikepedia ).