Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Date/time | Aircraft | Foe | Result | Location | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| u/c | 14 June 1917 | Nieuport 17 | Enemy aircraft |  | Mount Verena | Victory originally confirmed, but disallowed postwar |
| 1 | 25 October 1917 @ 0800 hours |  | Enemy aircraft | Forced to land | Marcesina |  |
| 2 | 7 November 1917 circa 1615 hours |  | Enemy aircraft | Forced to land | Fonsazo | Awarded Silver Medal for Military Valor |
| 3 | 7 December 1917 @ 1130 hours |  | Enemy aircraft |  | Val d'Assa |  |
| 4 | 13 December 1917 ca. 1130 hours |  | Enemy aircraft |  | Asiago |  |
| 5 | 30 January 1918 @ 1000 hours |  | Enemy two-seater |  | Col d'Eshele, Asiago | Awarded Silver Medal for Military Valor |
| u/c | 4 February 1918 ca. 1100 hours |  | Black enemy fighter craft |  | Valstagna | Claim shared with Antonio Reali |
| 6 | 5 February 1918 ca. 0830 hours |  | Enemy two-seater | Forced to land | Case Girardi | Shared with Marziale Cerutti |
| 7 | 13 February 1918 @ 0915 hours |  | Enemy fighter |  | Marcesina |  |
| u/c | 24 February 1918 |  | Enemy aircraft |  | Mount Grappa |  |
| 8 | 4 May 1918 @ 0850 hours | Nieuport 27 | Enemy aircraft |  | Montello | Austro-Hungarians reported no matching loss |
| 9 | 4 May 1918 @ 1025 hours | Nieuport 27 | Enemy fighter |  | Montello | Austro-Hungarians reported no matching loss |
Question:
at least how many aircrafts were forced to land
Answer:
3