Yeah, but you said 'most toughest.'
Right. So, after me doing a minor marathon to get home, me and the neighboorhood would get ourselves sorted to fend them off. There are issues though.
How long would we have to fend them off before we get some respite? Would this be an everlasting thing? By nightfall, we'd employ shift patterns. In order to get supplies, we'd need to go in groups. We'd also have to climb to the rooftops so we'd have leverage (

). I don't think zombies could scale heights could they?
The army of course would have to be patrolling the country in order to get ammunition and weaponry out to people, or are they all zombies too? And has petrol become obsolete?
There are too many questions to provide a sufficient answer.