Thumbs up from me.
It happened to a close friend of mine with his trusty old 240D. He lives 300 miles from me and sold the vehicle before I had a chance to help him do basically what you did. I doubt that you did any damage.
As dingy as I am, I'm shocked that I haven't put gas in any of my diesels.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in