from The Century Dictionary and Cyclopedia
- n. A raid, foray, or night attack (of Baluchis or Afghans).
Sorry, no etymologies found.
"The British can make a chapao* (* Sudden attack.) and be in Lahore while we are scattered!"
Sherpur, but those were never formidable, although they made themselves troublesome with some perseverance during the daytime, consistently refraining from night attacks, which was remarkable since ordinarily they are much addicted to the _chapao_.