Paul Robinson paid tribute to the resilience which is harvesting hard-earned points for Pompey.
The Blues carved out their second draw on the bounce on the road in Saturday’s 0-0 result at York.
The clean sheet made it just a single goal conceded in the last four games for Andy Awford’s men.
A run of defensive steeliness has been made all the more important with goals infrequent at the other end.
Andy Awford’s men have failed to score in four of their last six outings.
Robinson believes the stoutness at the back is down to hard graft.
He said: ‘We work hard and there is a good, honest group here.
‘We’ll take that clean sheet and keep trying to build on that.
‘Defensively we’ve been pretty good all the way through.
‘We had a little blip in the middle but we’ve never conceded loads of goals.
‘I think it’s about the team working incredibly hard.
‘It’s about hard work and hard work on the training pitch.’
Robinson admitted the past two games have been far from pretty for Pompey.
They have involved long treks up the country to Hartlepool and York on Saturday.
Two home games are up next but Awford’s men know there are a couple of other lengthy away days on the horizon.
Bury and Shrewsbury are still to come before the month is out.
Robinson is aware the unglamorous trips north will be crucial in deciding how Pompey’s season pans out.
He said: ‘It’s part and parcel of this league to go away from home and be at it.
‘You have to go to places which aren’t going to be attractive and perform.
‘You have to go to places with cold showers and bad facilities and put it in.
‘That’s part of the mentality of this league.
‘If we want to be successful this season we have to have the right mentality when we go away from home.
‘We have to keep the performance level up, keep the work-rate up and turn the performances into results.’
Pompey fans again made their voices heard throughout the 0-0 draw as 928 hardcore followers made the trip to Bootham Crescent.
That followed on from an even longer and similarly expensive trek to Hartlepool last week.
Robinson paid tribute to the supporters for their loyalty in travelling the country to support the team.
He said: ‘We have to thank the fans because it’s a long, old way from Portsmouth.
‘But they come out in numbers, get behind us and make a lot of noise.
‘The players are grateful and we’re just disappointed we couldn’t get them the win they deserved.
‘It can be a good away point – if we follow it up with a home win.
‘Their backing is fantastic to go to Hartlepool and then to follow it up with York.
‘It’s a big effort. We’re pleased with the point but disappointed it’s not all three.
‘Hopefully we can go back to Fratton Park and make sure it’s a good result for them.’