Truro City manager Steve Tully has said the manner of his side's 6-0 defeat by Oxford City in the National League South is a "worry".
It was City's heaviest defeat under Tully, while they also had Rob Farkins sent off just before the hour mark.
"Even at 3-0 down and with 10 men, I expect more from the players," he told BBC Radio Cornwall.
"I expect the players to have that little bit of spirit and fight, but we capitulated and that's a bit of worry."
He added: "It is definitely the hardest day of my managerial career but you have to take it on the chin and move forward."
After being promoted last season, Tully said Truro have struggled to adjust to the higher level.
They have managed just one victory from their first seven matches, losing three of their four home games.
"Our home form has been a disappointment and we have conceded early goals in the last six out of seven games - you are giving yourself an uphill battle," he said.
"We are playing against better players and we need a little bit of football 'know-how'.
"In time we will get better because we will make sure the players do, and if they don't, they will be moved on and we will get new players in."