<Tr> <Td> 21 Mar 1846 </Td> <Td> Frémont arrived at Sutter's Fort to ready a further expedition to the Oregon Territory . </Td> </Tr> <Tr> <Td> 28 Mar 1846 </Td> <Td> Zachary Taylor's force arrived at the Rio Grande near Matamoros . </Td> </Tr> <Tr> <Td> 30 Mar 1846 </Td> <Td> Frémont's party reached Rancho Bosquejo on Deer Creek, 200 miles north of Sutter's Fort . His tentative plan was to map a route from the western slope of the Cascades across the Great Basin to link with the Oregon Trail . (Historians have suggested this was a calculated delaying tactic .) </Td> </Tr> <Tr> <Td> late Mar 1846 </Td> <Td> Alarmed by Frémont's transgression at Gavilan Peak, General Castro called a military council in Monterey . </Td> </Tr>

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