Step-by-step explanation:
1862 Battles:
February: Capture of Forts Henry and Donelson
April: Battle of Shiloh
May: Battle of Seven Pines (or Fair Oaks)
August: Second Battle of Bull Run (or Second Manassas)
December: Battle of Fredericksburg
Significance of each battle:
The Capture of Forts Henry and Donelson was the first significant Union victory in the Western Theater of the Civil War and gave the Union control of the Tennessee and Cumberland Rivers.
The Battle of Shiloh was one of the bloodiest battles of the Civil War, resulting in a Union victory and allowing the Union to take control of much of western Tennessee.
The Battle of Seven Pines (or Fair Oaks) was a significant battle in the Peninsula Campaign, in which Union forces attempted to capture Richmond, Virginia, but were ultimately repelled by Confederate forces.
The Second Battle of Bull Run (or Second Manassas) was a major Confederate victory that allowed General Robert E. Lee to invade Maryland.
The Battle of Fredericksburg was a Confederate victory that resulted in high casualties for the Union and stalled Union progress in the Eastern Theater of the war.