On the night of 27/28 May, the BEF divisions near Lille were able to retreat over the Lys but only the III Corps of the French First Army (General René Prioux) managed to get away.
Pada malam 27/28 Mei, divisi BEF dekat Lille mampu untuk mundur melalui Lys tapi hanya Korps ke-III dari Angkatan Darat Pertama Prancis (Jenderal René Prioux) yang berhasil lolos.