\in-KUR-zhuhn; -shuhn\, noun
1. a sudden attack; invasion, raid
2. a running or flowing in
by 1432 "hostile attack," from Latin incursionem "a running against," from incurrere
Jerina's bulwarks failed to protect Bosnia from the last great incursion against Europe from the East, the invasions of Ottoman Turk armies into the southeastern corner of the continent beginning in the fourteenth century.
-- Chuck Sudetic, Blood and Vengeance