to pin;  to fasten
To pin a badge on one's hat
To fasten one's jacket with buttons;  to button one's jacket
Door closed and bolt fastened
to lay;  to set
To lay a trap;  to set a trap
To set a mine trap;  to mine
to infiltrate;  to plant
To unmask spies planted by the enemy
To plant one's own men in the key positions in the enemy ranks;  To infiltrate  one's own men into the key positions in the enemy ranks