The striker played 45 minutes of the reserves' 2-2 draw against Chelsea at Stevenage Borough.
His last outing was a Premiership defeat at Southampton back on December 27, 2000 and he's been missing since after groin and abdomen problems and a hernia operation.
"I was so pleased to be out there," said the 30-year-old at Broadhall Way. "It's been such a long time.
"All I was thinking as the whistle went was that I wanted to get through the game without any more injuries.
"The first game back is probably the worst but to tell the truth I thoroughly enjoyed it and I'm just happy to be playing again after a year out.
"It's great to be involved with the lads again. A year is a long time and just to be out there, in front of a crowd again, I enjoyed it. Now I want to take it on from here."
It wasn't just a run-around return either. Chris was bumped and buffeted in a competitive affair that saw Chelsea take a 2-0 lead only for Danny Foster and John Jackson's late piledriver to secure a 2-2 draw.
"I felt quite good," added Chris. "My movement was good for my first game and now I'll look forward to the next one.
"You can't come into these games and suddenly think you're ready. I've tested it, had a run out, taken a few knocks and now I'll look forward to the next one.
"The next target is the next reserve game and hopefully I'll be pushing to get back into the first team squad before the end of the season. That would be nice."
Paul Miles at Broadhall Way
Chris Armstrong expressed his relief and delight after returning to action for the first time in over 15 months last night.