| Former Iron players born on this day: Syd Ottewell (1919), Mike Williams (1944). |
Scunthorpe picked up a second league win of the week to cause an upset as Watford's fine form came to an end On This Day in 2010.
A Michael O'Connor set-piece was only half cleared and Cliff Byrne drilled a low strike into the bottom corner.
Martyn Woolford was on hand to double the lead before the break, latching onto a poor clearance before lashing a left-footed strike into the net.
Stephen McGinn and Jordon Mutch both went close to pulling a goal back for the hosts but Scunthorpe held on.
Hornets centre-half Adrian Mariappa also had a great chance in the dying moments but saw his header clear the crossbar.
Overall playing record for October 23: Played 17, Won 11, Drawn 3, Lost 3, Scored 26, Conceded 12.
The Iron's full record for October 23 is as follows:
| YEAR | COMPETITION | RESULT | IRON SCORERS |
| 2021 | LG 2 | Iron 2-1 Crawley | Loft, Scrimshaw |
| 2018 | LG 1 | Blackpool 1-0 Iron | |
| 2012 | LG 1 | Iron 2-3 Preston | Clarke, Hawley |
| 2010 | CHAMP | Watford 0-2 Iron | Byrne, Woolford |
| 2007 | CHAMP | Sheff Wed 1-2 Iron | Paterson 2 |
| 2004 | LG 2 | Iron 1-0 Yeovil | Butler |
| 2001 | DIV 3 | Iron 2-0 Southend | Carruthers, Beagrie |
| 1999 | DIV 2 | Chesterfield 1-1 Iron | Fickling |
| 1993 | DIV 3 | Torquay 1-1 Iron | Toman |
| 1990 | DIV 4 | Chesterfield 1-0 Iron | |
| 1984 | DIV 4 | Iron 2-0 Torquay | Broddle 2 |
| 1982 | DIV 4 | Iron 2-1 Tranmere | Baines, Cowling |
| 1979 | DIV 4 | Iron 3-0 Darlington | O'Berg, Cammack, Green |
| 1976 | DIV 4 | Iron 2-0 Colchester | Keeley, Pilling |
| 1973 | DIV 4 | Iron 1-1 Gillingham | Simpkin |
| 1971 | DIV 4 | Barrow 0-1 Iron | |
| 1954 | DIV 3N | Tranmere 1-2 Iron | Brown, Haigh |
