Battle of Wolf 359
Sequence of Events
Very little is known about how this battle transpired. After the Borg captured Captain Picard from the Enterprise, they continued toward Earth, passing the star system Wolf 359 on their route. A fleet of 39 Federation starships intercepted the Borg Cube there. According to Admiral Hanson, several Klingon ships were en route to assist, but it is unclear whether they arrived in time to take part in the battle.
Using knowledge of Federation assets and tactics acquired when they assimilated Picard, the Borg easily defeated the Federation fleet. All ships in the Federation fleet were destroyed or disabled, and only a few personnel escaped in life pods to be picked up later.
That Starfleet could only muster 40 starships to defend the Federation against a threat as dire as the Borg shows the limits of Federation propulsion and fleet strength. Given months of logistical preparation, the Federation would be able to deploy fleets of hundreds of ships in the Dominion War, but with only days of warning, they could not gather even a tenth of that number to defend the Federation capital against the Borg invasion.