skirmish
Concise Oxford English Dictionary © 2008 Oxford University Press:
skirmish/ˈskɜːmɪʃ/
▶noun an episode of irregular or unpremeditated fighting, especially between small or outlying parts of armies. ▶verb engage in a skirmish.
– derivatives
skirmisher noun.
skirmisher noun.
– origin ME: from OFr. eskirmiss-, lengthened stem of eskirmir, from a Gmc verb meaning ‘defend’.
'skirmish' also found in these Oxford entries:

