If his place of encampment is easy of access, he is tendering a bait.
易 is here the opposite of 險 in § 18. The reading of the _T‘ung
Tien_ and _Yü Lan_, 其所處者居易利也, is pretty obviously corrupt.
The original text, which transposes 易 and 者, may very possibly be
right. Tu Mu tells us that there is yet another reading:
士爭其所居者易利也.