The Spanish army with 6,000 foot and 9,000 horse formed up with its right on the sea across the sand-hills to the canal of Furnes on their left. The regular Spanish infantry tercios were on the right under the command of Don Juan, the English Royalist regiments under the Duke of York were on their left to the right centre, the Walloon and German tercios were in the centre and on the left were the French rebel Frondeurs and some other troops. The Spanish cavalry was drawn up in line behind the infantry. In their rush to relieve Dunkirk the Spanish had left their artillery behind.