Possible Clues:

• Moves two pieces at once, in a way
• Makes a two-man move
• Buildings made of stone or sand
• Rooks on a chessboard
• Forts
• Groups in society holding large, defendable properties
• Moves involving kings -- and where they might move to?
• Symbols of royalty
• Knights' neighbors in chess
• The French occupying sheds or big buildings