sentinelled
Webster's Dictionary (GCIDE)
Sentinel \Sen"ti*nel\, v. t. [imp. & p. p. Sentineledor Sentinelled; p. pr. & vb. n. Sentineling or Sentinelling.]
1.To watch over like a sentinel. "To sentinel enchanted land." [R.] --Sir W. Scott. [1913 Webster]
2.To furnish with a sentinel; to place under the guard of a sentinel or sentinels. [1913 Webster]