Moose are large animals in the deer family and are found abundantly in parts of North America and Europe. These animals can also easily defend themselves in a human encounter.
As with any wild animal that may pose a threat to human safety, respect them and avoid whenever possible an encounter.
Male moose (known as bulls) have been known to attack semi trailers and trains when aggressive during the mating season in September and October. These powerful animals may weigh in at about 1500 lbs and measure approximately 6 feet or so at the shoulders. Females (known as cows) that are smaller, may be dangerous in the spring around their calves.
If you encounter a moose, slowly back away and give it space so that it doesn't feel cornered or other. If you see that the moose is getting aggressive, you have a few options depending on the encounter. If you can climb a tree, do so but climb high enough. Be prepared in that you may be held up there for awhile, and even if the moose leaves, it may come back.
A moose that charges at you may simply be attempting to frighten you off, and may not actually make physical contact with you. If it makes contact roll into a ball and protect your head and face from its hooves. Do not get up after the moose stops, or it may continue to beat on you. Give it enough time to get away and put distance from you before getting up.
If you feel to run to safety in your circumstances you might have a chance, but it is risky. They can run up to 35 miles per hour and plow through thick vegetation and deep snow.
If you can get behind a large tree and keep it between you and the moose, you have a small chance at success doing this but it is better than nothing. However if you can get into a cluster of large enough trees that the moose cannot get into or knock down, you'll be safer in this 'cage'.
Here are some links to help you learn more about moose.
1. Wikipedia – moose
2. National Geographic – moose