by surprise
Notre armée prit le royaume par surprise.
Our army took the kingdom by surprise.
They took me by surprise.
You took me by surprise.
Le chat m'a pris par surprise !
The cat caught me by surprise!
It took me by surprise.
Voilà comment on attaque par surprise.
That's how you attack by surprise.
— The Garden of Sinners, film 5 : Spirale contradictoire (2008)
I was taken by surprise.
She took me by surprise.
J'ai pris Tom par surprise.
I took Tom by surprise.
He took me by surprise.