The hours-long attack on the strategic capital of Borno state was the Islamists' second attempt to take Maiduguri in a week.
As government forces were holding off Boko Haram in Maiduguri, the airforce of neighbouring Chad was pounding the militants' positions in Gamboru, a town on Nigeria's border with Cameroon 140 kilometres (87 miles)to the northeast.
With near-relentless violence plaguing much of the northeast, and Boko Haram still in control of large swathes of the region, fears are mounting over the prospect of organising polls on February 14.
But hundreds of thousands of voters in the northeast, an APC stronghold, could be disenfranchised by the unrest if the election goes ahead in two weeks.
Heavily-armed gunmen attacked the southern edge of Maiduguri at roughly 3:00 am (0200 GMT), setting off explosives as they tried to enter the city, several residents said.
Repelled in the south by troops backed by vigilantes, they regrouped and tried to take the city from the east, where they again met stiff resistance.
Defence ministry spokesman Chris Olukolade said the assault on the town, where the extremist group was founded more than a decade ago, was "contained" and that "the terrorists incurred massive casualties."
"The situation is calm as mopping up operation in the affected area is ongoing," he wrote in a text message, a claim consistent with witness reports.
Despite being under fire in recent months, Maiduguri has become a place of refuge for people forced to flee other areas in Borno that have been taken over by the Islamist rebels.
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