"The primary role of the larger contre-torpilleur was scouting with battleline defense secondary and attacking the enemy battleline in third place." - this reads awkwardly and took a couple of tries to parse. Part of the problem is non-parallel structure (i.e., you have a list of gerund, noun, gerund)
"all weathers" - I think you can ditch the "s"
"The former was sunk the next day off Dunkirk and the latter" - former and latter only work when discussing 2 things - you have 3 destroyers mentioned here.
"They were turned her over" - something's wrong here
"The primary role of the larger contre-torpilleur was scouting with battleline defense secondary and attacking the enemy battleline in third place." - this reads awkwardly and took a couple of tries to parse. Part of the problem is non-parallel structure (i.e., you have a list of gerund, noun, gerund)
"all weathers" - I think you can ditch the "s"
"The former was sunk the next day off Dunkirk and the latter" - former and latter only work when discussing 2 things - you have 3 destroyers mentioned here.
"They were turned her over" - something's wrong here