Scotland's First Minister Alex Salmond has sought to calm fears that there would be repercussions against opponents of independence if the Yes campaign wins the upcoming referendum.

"The day after a Yes vote there will cease to be a No campaign and Yes campaign — only Team Scotland. We will approach the success of Yes with magnanimity to all," Salmond said Saturday.

He spoke after former Scottish National Party deputy leader Jim Sillars told supporters there would be "a day of reckoning with BP and the banks" after the oil company and financial institutions voiced warnings this week over independence.

Saturday marked the biggest day of political campaigning Scotland has seen, including a peaceful march of 15,000 pro-unionists through Edinburgh and 35,000 Yes volunteers staging events across the country.