Captain James Cook saw Mt. Redoubt during the summer of 1778, describing it as "emitting a white smoke but no fire which made some think it was no more than a white thick cloud such as we have frequently seen on the Coast, for the most part appearing on the sides of hills and often extends along a whole range and at different times falls or rises, expands or contracts itself and has a resemblance to Clouds of white smoke.
But this besides being too small for one of those clouds, remained as it were fixed in the same spot for the whole time the Mountain was clear which was above 48 hours."
However, several sources call this a "discredited eruption".
There are several other of these activities that are not called eruptions.

In 1819, smoke was observed at the mountain.
However, this is often not recorded as an eruption as the information was insufficient to identify it as such.
Similarly, in 2003, a blowing cloud of snow was mistaken by an employee of the ConocoPhillips Building in Anchorage for an ash plume.
Possible steam-vapor let off was observed in 1933 at the mountain.
Captain James Cook saw Mt. Redoubt during the summer of 1778, describing it as "emitting a white smoke but no fire which made some think it was no more than a white thick cloud such as we have frequently seen on the Coast, for the most part appearing on the sides of hills and often extends along a whole range and at different times falls or rises, expands or contracts itself and has a resemblance to Clouds of white smoke. But this besides being too small for one of those clouds, remained as it were fixed in the same spot for the whole time the Mountain was clear which was above 48 hours." However, several sources call this a "discredited eruption". There are several other of these activities that are not called eruptions.
In 1819, smoke was observed at the mountain. However, this is often not recorded as an eruption as the information was insufficient to identify it as such. Similarly, in 2003, a blowing cloud of snow was mistaken by an employee of the ConocoPhillips Building in Anchorage for an ash plume. Possible steam-vapor let off was observed in 1933 at the mountain.
Mount Redoubt