1. Tell everyone to be on the alert.

Que tout le monde soit sur le qui-vive.

2. The exercise area abounded with icebergs and growlers, which required bridge watchkeepers to be constantly on the alert, particularly at night; the presence of large masses of ice also made it difficult for searching aircraft as they had to spend a large part of their time investigating false contacts.

La région de l’exercice était couverte d’icebergs et de glaces flottantes qui tenaient les hommes de quart en alerte, en particulier durant la nuit, et rendaient plus difficile la tâche des avions de reconnaissance qui consacrèrent une partie de leur temps à l’inspection de faux contacts.