flanking

verb
  1. 1

    To attack the flank(s) of.

  2. 2

    To defend the flank(s) of.

  3. 3

    To place to the side(s) of.

  4. 4

    To be placed to the side(s) of something (usually in terms of two objects, one on each side).

Source: https://en.wiktionary.org/wiki/flank, https://en.wiktionary.org/wiki/flanking