Were Dunkerque's 13-inch guns enough for modern war?

Were Dunkerque's 13-inch guns good enough for a modern battleship?

No. This assessment treats 15 inches as the practical Second World War battleship threshold, with 14 inches only at the entry level.

Thirteen-inch guns are judged inadequate for a fully modern Second World War battleship in this assessment. Fourteen inches is treated as an entry-level calibre, with 15 inches the preferred practical threshold. A ship designed to defeat cruisers could therefore remain underarmed for a general battleship fight. German ships below that threshold still mattered because they were Germany's strongest available units and overmatched ordinary cruisers.