Mot ppl think it was because the halberds they were using weren't so good agaisnt cavalry, but it might not've ben.
Instead it is suggested in Armies of the Middle Ages that they adopted pikes because the halberds were not good enough vs DISMOUNTED men at armes who were using their lances as spears - they were longer than the halberds!
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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