From DominionStrategy Wiki
Reveal the top 4 cards of your deck. Put the Victory cards and Curses into your hand. Put the rest back in any order.
Patrol is an Action card from the second edition of Intrigue. It is a terminal draw card that will also sift Curses and Victory cards off the top of your deck for you, clearing out your next hand of potentially dead cards.
 Official FAQ
- First draw 3 cards, then reveal the top 4 cards of your deck.
- Put the revealed Victory cards and Curses into your hand; you have to take them all.
- Put the rest of the cards back on your deck in any order you choose.
 Other Rules clarifications
 In other languages
- Russian: Дозор (pron. dozor)
 Secret History