Board Thread:Questions and Answers/@comment-27698078-20160220132448/@comment-28053036-20160220135528

Their levels are a bit too low for 5-4, as it's recommended to bring lv70+ uchis to not lose too many troops. Era 5 maps require swords that have higher leadership stats like oodachis and tachis. IIRC lv99 uchis will still lose troops occasionally with certain formation or bad RNG.