I'm watching the Voyager episode Persistence of Vision from season 2.
Two ships just decloaked off the bow of the ship and Commander Chakotay ordered evasive maneuvers. The Captain in me said he should've called for (at least) a Yellow Alert, shields up, before opening a channel or evasive maneuvers.
The alien vessels fired on Voyager and Mr. Tuvok reported shields at a certain %. I was stunned — how is it that the shields were even up, unless they are always up?
KIM: Two ships decloaking.
TUVOK: The Bothan ship is powering up weapons.
CHAKOTAY: Evasive maneuver gamma five.
TUVOK: Shields at eighty seven percent. Minor damage on decks four and twelve.