What Mormon leader led his people west during the war of 1812?

The Mormon church was not even around in 1812

That makes no sence Joesph Smith was 7 in 1812. he was 14 wen he founded the Mormon church.

_The answer is NONE. The LDS Church was established in 1830

Members of the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) believe that God lead them to Utah. Individual groups traveling by wagon or handcart between 1847 and 1870 were lead by experienced trail guides.

Corrections to statements above:

Joseph Smith did NOT 'found the Mormon church'. God restored the gospel to the earth through Joseph Smith.

Joseph Smith received a vision from God when he was 14 years old. The Church was established 10 years later, when Joseph Smith was 24 years old.