The Collaborative International Dictionary of English v.0.48:
Skirmish \Skir"mish\, v. i. [imp. & p. p. Skirmished; p. pr. &
vb. n. Skirmishing.] [OE. skirmishen, scarmishen, OF.
escremir, eskermir, to fence, fight, F. escrimer, of German
origin; cf. OHG. scirmen to protect, defend, G. schirmen,
OHG. scirm, scerm, protection, shield, G. schirm; perhaps
akin to Gr. ???? a sunshade. Cf. Scaramouch, Scrimmage.]
To fight slightly or in small parties; to engage in a
skirmish or skirmishes; to act as skirmishers.