As a rule, the aggressive spirit that should characterise the
non-dealer’s play of a spade hand is lacking. While a spade is not
necessarily made from weakness, the declaration in itself shows
sufficient weakness in the side suits to embolden the adversaries’
play. With a hand containing five trumps (spades) the initial opening
should be the trump. Your partner must hold suit strength which your
trump lead will protect.
If your five trumps contain a tenace and you can advantageously lead
from another suit, it may be advisable to wait for your partner to
lead to your tenace, particularly if by doubling you have indicated
trump strength.
If you have been redoubled and your hand contains four trumps and
strength in the side suits, the trump lead requires more careful
consideration.
Unless your partner has doubled the spade declaration it is
impossible for you to place the trump strength, and you should be
cautious about leading originally from a short trump suit.