Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_74381 ( "Team" text, "Outgoing manager" text, "Manner of departure" text, "Date of vacancy" text, "Position in table" text, "Replaced by" text, "Date of appointment" text )

### Question ###
How many times did Silas leave as a team manager?

### Accurate SQL ###

SELECT COUNT("Manner of departure") FROM table_74381 WHERE "Outgoing manager" = 'Silas'