<prompt> Complete the following phrase: Sandile 1823 - 1878 was n Xhosa-opperhoof. Hy is gebore naby die oosgrens in die Oos-Kaap. Omstreeks 1850 word hy opperhoof en bots met sir Harry Smith. Hy was betrokke in verskeie  <response>: grensoorloë. Hy is in 1878 oorlede. 