Over in one corner sat Alice, a strong-minded 27-year-old who always said what she thought, regardless of how much it might hurt someone else. In the other corner was Sarah, a thirtysomething high-flier who would stand up for herself momentarily - then burst into tears and run for the ladies.
Their simmering fight lasted hours, egged on by spectators taking sides and fuelling the anger. Sometimes other girls would join in, either heckling aggressively or huddling defensively in the toilets. It might sound like a scene from a tawdry reality show such as Big Brother, but the truth is a little more prosaic: it was just a normal morning in my office.
The venomous women were supposedly the talented employees I had headhunted to achieve my utopian dream - a female- only company with happy, harmonious workers benefiting from an absence of men.
It was an idealistic vision swiftly shattered by the nightmare reality: constant bitchiness, surging hormones, unchecked emotion, attention-seeking and fashion rivalry so fierce it tore my staff apart.
When I read the other day that Sienna Miller had said there was no such thing as 'the Sisterhood', I knew what she meant.
I can understand why people want to believe that women look out for each other - because with men in power at work and in politics, it makes sense for us to stick together.
In fact, there was a time when I believed in the Sisterhood - but that was before women at war led to my emotional and financial ruin.
Five years ago, I was working as a TV executive producer making shows for top channels such as MTV, and based in Los Angeles. It sounds like a dream job and it could have been - if I'd been male.
Working in TV is notoriously difficult for women. There is a powerful old boys' network, robust glass ceiling and the majority of bosses are misogynistic males.
Gradually, what had started out as a daydream - wouldn't it be great if there were no men where I worked? - turned into an exciting concept. I decided to create the first all-female production company where smart, intelligent, career-orientated women could work harmoniously, free from the bravado of the opposite sex.
In hindsight, I should have learned the lessons of my past - at my mixed secondary school I was bullied by a gang of nasty, name-calling girls, so I knew only too well how nasty groups of women could become.
And working in TV, I'd met lots of super-competitive 'door-slammers' who'd do anything to get to the top. But I told myself that, with the right women, work could be wonderful.
So, in April 2005, I left my job, remortgaged my house - freeing up close to £100,000 - and began paying myself just £700 a month to set up this utopian business. Having worked extremely hard for 12 years, I had lots of experience and a good reputation. What could go wrong?