Support came from:
Patriotic concerns about foreign rule
Areas close to continental ports, familiar with Spanish presence
Parts of Kent's cloth industry, which was in decline
Protestant strongholds
Local officials tried to stop rebels, but 300 of Lord Cobham’s men defected and joined Wyatt.
Rebels seized ships at Gravesend, numbers grew to ~3,000. Wyatt began his march on London.
However, his campaign was marked by hesitation:
Attacked Cooling Castle unnecessarily
Waited at Blackheath to consider Mary’s offer
Reached Southwark, but London Bridge was blocked
Spent 3 days looting Winchester Palace instead of advancing