Throughout the 17th century large parts of Europe were depopulated during the wide-ranging and savage wars of religion and dynasty, involving all of the major powers. This was therefore a key period in the development of 'modern' infantry tactics, such as the use of pole-arms and muskets together hence the popular expression 'pike and shot'. These infantry tactics involved different national schools on thought and practice, and were tested bloodily in great battles. This title covers the Dutch-Spanish wars of independence, The Thirty Years' War and the English Civil Wars.