What does the word incursion mean?

Usage examples for incursion

  1. Feeling that his cousin Frederic van den Berg, who had been despatched from before Ostend to command the relieving force near Bois- le- Duc, might take advantage of the prematurely frozen canals and rivers to make an incursion into Holland, he left his city just as his works had been sufficiently advanced to ensure possession of the prize, and hastened to protect the heart of the republic from possible danger. – Project Gutenberg History of The Netherlands, 1555-1623, Complete by John Lothrop Motley