Quote This was done by 1400 maa under Duke Leoppold at Sempach in 1386 - they inflicted heavy casualties on one Swiss division before being defeated (there were 2000-2500 Swiss) - the Swiss were all halberdiers at this tiume.

At Arbedo in 1422 the Italian Condotierri chargged and were repulsed with heavy losses, then dismounted and fought on foot - the Swiss were defeated but the Milanese didn't follow up. The Swiss were approx 1/3 pike and 2/3rd halberd here.
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Quote This evidence suggests that the driving force was actually that the halberds were too short against spears used by men on foot.[/QUOTE]

Interesting idea. However, your evidence doesn't seem to back it up.
At Sempach where there was all Halberdiers, the Swiss won.
At Arbedo where there was 1/3 pike, the Swiss lost.