Discworld – Pyramids (Terry Pratchett)

Pinpoints of firelight among the limestone pricked out the lines of the opposing armies. Deep and stylised though the enmity was between the two empires, they both abided by the ancient tradition that warfare wasn't undertaken at night, during harvest or when wet. It was important enough to save up for special occasions. Going at it hammer and tongs just reduced the whole thing to a farce.

In the twilight on both sides of the line came the busy sound of advanced woodwork in progress.

It's said that generals are always ready to fight the last War over again. It had been thousands of years since the last war between Tsort and Ephebe, but generals have long memories and this time they were ready for it.

On both sides of the line, wooden horses were taking shape.