Brentford were reduced to 10 men five minutes into the second period when James Tarkowski received a second yellow card but Orient failed to capitalise.
The Bees battled heroically to defend their lead and they came closer to adding to their lead when Alan Judge struck the upright in added time.
"There was a great atmosphere, a packed house, a lot at stake and a big "derby" which of course both teams realised and I'm really delighted with the way the boys reacted to it," he said.
"The key was that we just concentrated on doing what we do well. We will always try to play the game our way and at our tempo.
"When we went down to 10 men, every one of our players out there did fantastically well for us.
"We had a lot of young players out there, people like George Saville at 20-years-of-age, Harlee Dean and Adam Forshaw at 21 so people like Alan Judge are looking like old men at 24 or 25.
"All the senior pros did their part of course, and everyone turned in an outstanding performance. I think we have got a better balance this year, they have learned from last year's disappointments.
"I thought that there was more pressure on Orient because we had a couple of games in hand and we knew they would try and impose themselves from the start.
"They were direct but I thought we stood up well to that and after the sending off of James Tarkowski, I thought that we were magnificent."
Orient boss Russell Slade was at a loss to understand how his team had failed to get something out of the game.
"How we've not scored, I don't know," he stated. "We did everything we possibly could but you would not expect anything less of this group.
"As usual, the effort, the determination and the desire was of a high standard and that accumulated into what was a really good first-half performance. We were unfortunate to go into the changing rooms one goal down.
"The timing of their goal was a blow, it's never a good time to concede a goal especially when it's by your close rivals but we've come from behind before and we fully expected to put them under pressure.
They made it difficult for us when they went down to 10 men although in my opinion, they should have had a man sent off before that when Donaldson went in and put his hand into the face of one of my players. He was fortunate to stay on the pitch in my opinion.
"We should have closed the ball down a bit better when their player scored, we backed off a bit."
- Sports & Recreation
- Adam Forshaw
- James Tarkowski
- Marcello Trotta
- Alan Judge